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Native & Naturalized Vascular Plants – Comparative statistics

(source: Status of Vascular Plants: A report produced as part of the State of the Preserve assessment, 2008).

		California TJM, 1993*	Santa Cruz Mtn Thomas, 1961		Jasper Ridge**
acres	100,000,000			887,039		1,189
taxa	7266			1796		761
genera	1222			650		395
families ***	173			167		98

* T. Rosatti (2005) Jepson Manual Update: Attempting to Quantify the Changes Expected for TJM2. The Jepson Globe 16:1-.

** JRBP taxa include some waifs and hybrids not given taxonomic status in TJM or TJM2. Native and naturalized taxa after TJM2 changes as of 2016 is 761 vascular plants for JRBP.

*** Comparison of plant families according to TJM2 (2012) see Phylogentic guide to Jasper Ridge Vascular Plant Families.

All Vascular Plants documented at Jasper Ridge Biological Preserve

(source: Status of Vascular Plants: A report produced as part of the State of the Preserve assessment, 2008).

	taxa native	taxa naturalized	total	% native / naturalized	% of total
I. Ferns & Allies	18	0	18	100.0% / 0%	02.3%
II. Gymnosperms	2	1	3	66.6% / 33.3%	00.3%
III. Angiosperms	546	221	767	71.3% / 28.7%	97.4%
Dicots	419	164	583	72% / 28%	74.1%
Monocots	127	57	184	69% / 31%%	23.3%
Totals I+II+III	566	222	788	72% / 28%	100%

Comparison of Species Richness (1 sq. m). JRBP data from James Griffin, 1979-1981. Count, standard error, and other details are from Stromberg, M.; Griffin, J. 2001. Composition, Invasibility, and Diversity in Coastal California Grasslands. Madroño 48:236-52.

Community name	No. species
CA Coastal Terrace Prairies	22.6
JRBP Serpentine Prairie	17.0
JRBP Blue Oak Woodland	15.5
Monterey Co., Annual Grassland	14.7
Napa Co., Sepentine Meadows	12.3
Napa Co., Non-Sepentine Meadows	10.3

Naturalized Angiosperms

V = 100 I/S%, where I is the total of introduced taxa, and S is the total number of native and introduced species

	1962	1971	1973	1986	2006
Angiosperms	I=89 & V=20%	I=108 & V=22%)	I=161 & V=25%	I=175 & V=27%	I=222 & V=28%

1962-1986 figures from Macdonald et al. (1988) Introduced Species in Nature Reserves in Mediterranean-type Climatic Regions of the World. Biological Conservation 44: 37-66.

Invasion Index

Comparison of Grass Flora with California Grass Flora in The Jepson Manual (TJM) 1993

Poaceae	Jasper Ridge Preserve	TJM 1993*	%
Genera	44	117	37%
Taxa (species, subsp, vars)	101	470	21%

*As reported in Table 6 “Comparison of comprehensive surveys of the California grass flora” in James Smith (2014) Field guide to grasses of California, UC Press.

Other Jasper Ridge Biological Preserve Grass Statistics

· 47 taxa (46.5%) are annuals (compared with 30% for California).

· 54 taxa (53.5%) are perennials (compared with 70% for California).

· 44 taxa (43.6%) are native (compared with 54.4% for California).

· 57 taxa (56.4%) are naturalized, native to other states or countries, prominently the barnyards of Spain (compared with 45.6% for California).

· 12 taxa are native annuals; 25.5% of all annuals.

· 32 taxa are native perennials; 59% of all perennials.

· 6 taxa are endemic to California plus CFP in SW Oregon and Baja Norte.

· Arrival dates of some naturalized grasses.

Major Collectors

Source: JROH Database, may vary slightly from Consortium of California Herbaria (CCH) totals due to lag time from local accessioning to Consortium submission and other CCH database technicalities. John Thomas’ collections exceed the CCH single search maximum default retrieval limit.

	Voucher dates	Number sheets	Number Taxa
Thomas, J.H.	1955-1992	3,454
Rawlings, J.	2004-	423	267
Corelli, T.	1990-	157	131
Dengler, H.	1957-1982	94	85
Zabel, C.	1989-2007	88	78
Lambrecht, A.	1989-	85	73
Breedlove, D.	1971	70	61
Lennihan, W.	1980-1990	68	52
Dudley, W.R.	1893-1910	53	43
Abrams, L.R.	1898-1934	51	40

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